qmk_userspace/keyboards/tutte_coxeter_36k
Peter J. A. Cock a3b55131c6 Add vial.json with same sparse matrix as QMK keyboard.json
Following the original Gamma-Omega board Vial firmware with a simple
ortholinear representation without the splay and stagger.
2025-06-28 09:16:04 +09:00
..
keymaps Add vial.json with same sparse matrix as QMK keyboard.json 2025-06-28 09:16:04 +09:00
keyboard.json Rename tutte_coxeter_36e -> tutte_coxeter_36k 2025-06-16 11:44:08 +09:00
readme.md fix typo 2025-06-25 10:06:22 +09:00

Tutte Coxeter 36k

Partial Tutte-Coxeter Graph (26/30 vertices, 36/45 edges)

This is firmware for a Raspberry Pi Pico PR2040 controller monoblock 36 key design (split 3x5_3 - three rows of five, and three thumb keys, for each hand). This is a diode-free design with a sparse 13 by 13 scanning matrix designed using a partial Tutte-Coxeter graph (using only 26 vertices or GPIO pins, with 36 edges or keys - see this blog post for background, although the final pin selection and trace routing changed).

The first physical PCB for this was designed using the Gamma Omega keyboard footprint from Ergogen. This is intend use the same Raspberry Pi Pico YD-RP2040 microcontroller board to fit the same 3D printed case, including reset button placement.

Make example for this keyboard (after setting up your build environment):

make tutte_coxeter_36k:default

Flashing example for this keyboard:

make tutte_coxetter_36k:default:flash

See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.

Bootloader

Enter the bootloader in 3 ways:

  • Bootmagic reset: Hold down the key at (0,0) in the matrix (bottom left key, Qwerty z) and plug in the keyboard
  • Physical reset button: Briefly press the button on the back of the controller (if physically accessible)
  • Keycode in layout: Press the key mapped to QK_BOOT if it is available